William Sager’s 20-year hunch has
paid off in a very big way.
In September, the University of
Houston geophysicist and his team announced that Tamu Massif, an
underwater volcano about a third of the way from Japan to Hawaii, is by far the
largest volcano on the planet.
For two decades, using sonar and
other undersea mapping methods, Sager has been studying an oceanic plateau in
the northwestern Pacific called Shatsky Rise. Over several expeditions, he
began to suspect that the subtly dome-shaped formation at Shatsky’s south end,
which he named Tamu Massif, might be an enormous volcano.
To confirm his theory, Sager’s team
drilled core samples and bounced seismic waves through Tamu’s layers to
determine its composition. They discovered Tamu’s 120,000 square miles were
made of massive lava sheets, up to 75 feet thick that had erupted from a single
summit about 145 million years ago.
In square miles, Tamu Massif is
larger than Arizona. Its single summit dwarfs multi-volcano complexes, also
known as composite volcanoes, on Hawaii and Iceland. With 75 percent of the
volume of Mars’ gigantic Olympus Mons, Tamu ranks as the second-largest known
volcano in the solar system.
Sager believes it’s possible that we
may one day find even greater volcanic giants beneath the waves. For now,
however, he is savoring a sweet moment 20 years in the making.
“As scientists, we spend our lives
doing research,” says Sager. “We get maybe one moment when we can make people
look up from their smartphones and be reminded of the
wonder in the world.”
-- Submitted By
--VANSH JINDAL
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